Here are some photos of the first alternate main route for this section.
This alternate main route starts near Alberton MT, loops SW to Elk City ID, then returns to Montana to rejoin the main route west of Phillipsburg MT.

Again, the photos are in order for each day, from the west heading east.

NR41MT1 - near Alberton MT to Lochsa Lodge ID

NR42ID1 - Lochsa Lodge ID to Elk City ID

NR43ID2 - Elk City ID to Derby MT

No pictures available, see notes as to why.

NR44MT3 - Derby Mt to Rock Creek MT

This alternative main route then returns to the main route west of Phillipsburg MT.

I see it all and the shots looks good. The tracks look confusing unless there is a main color to follow and the others are side tracks. Is the main look sucky or just that there is so much to see and ride? This looks like something I would really like to ride. Love it up there.